Deal Is Worth More Than $9 Billion and Could Bolster Fox's Pursuit of Time Warner

LONDON—In a deal that adds firepower to Rupert Murdoch's 21st Century Fox in its multibillion-dollar quest for Time Warner Inc., British Sky Broadcasting Group PLC has made its move to build "Sky Europe."

The U.K.'s market-leading pay-television operator Friday said it agreed to acquire its sister companies in Germany and Italy from 21st Century Fox in a deal worth just over $9 billion, the majority in cash, to create a...